package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;

import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;



    /*
    * 添加购物车
    * @param shoppingCartDTO
    *
    * */

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);// 将dto对象拷贝到entity对象中
        // 只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        if (shoppingCart.getDishId() == shoppingCart.getUserId()){
            Setmeal setmeal = setmealMapper.getById(shoppingCart.getSetmealId());
            shoppingCart.setName(setmeal.getName());
            shoppingCart.setImage(setmeal.getImage());
            shoppingCart.setAmount(setmeal.getPrice());
            shoppingCart.setAmount(setmeal.getPrice());
            shoppingCart.setDishFlavor(shoppingCartDTO.getDishFlavor());
            shoppingCart.setNumber(1);
            shoppingCartMapper.insert(shoppingCart);
            log.info("添加购物车成功");
        }

        // 判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList != null && shoppingCartList.size() >0){
            // 如果存在，就在原来数量基础上加一
            shoppingCart= shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            // 如果不存在，则添加到购物车，数量默认就是一
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                // 添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                // 添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /*
    *
    * 查看购物车
    * */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
    }


    /*
    * 清空购物车
    * */
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());

    }


    /*
    * 删除购物车的一个商品
    * @param shoppingCartDTO
    *
    *
    * */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        // 设置查询条件，查询当前等克鲁用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList != null && shoppingCartList.size() > 0){
            // 如果购物车中有数据，则删除
            shoppingCart = shoppingCartList.get(0);
            Integer number = shoppingCart.getNumber();
            if (number == 1){
                // 如果数量为1，则直接删除
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                // 如果数量不为1，则数量减一
                shoppingCart.setNumber(shoppingCart.getNumber() -1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }

    }
}
